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• Acta Universitatis Carolinae. Mathematica et Physica
• Volume 46

Author: Piper, Greg

• Piper, Greg: Regular closure and corresponding ${\Cal P}_K \lambda$ versions of $\diamondsuit$ and $\clubsuit$. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 46 (2005), issue 2, pp. 67-76